fraitkenbera



(No Model.)

2 Sheets-Sheet 1.

E. FRANKENBERG.

POLYPANTOGRAPH.

Patented 00k. 4, 1887.

WITNESSES:

A TTOHNEYS.

N FEYHS, Plwwulhognphan Washington, D C.

2 Sheets-Sheet 2.

E. FRAHKENBERG.

(No Model.)

'POLYPANTOGRAPH.

No. 370,939. Pate nted Oct. 4,1887...

.W/T/VESSES: 624% L Q24 Do.

ATTORNEYS,

N. PETERS Photo-Lflhogn hur. Wnhingmn. D. c.

. of their size.

'UNITED STATES PATENT OFFICE.

EDUARD FRANKENBERG, OF HANOVER,- PRUSSIA, GERMANY.

POLYPANTOGRAPH.

SPECIFICATION forming part of Letters Patent No. 370,939. dated October4-, 1887.

Application filed April 1, 1857. Serial No. 233.318. (No model.)Patented in Austria-HungaryJune 12,1887, No. 5,919 and No. 25,321.

To all whom it may concern.-

Be it known that I, EDUARD FRANKENBERG, of Hanover, Kingdom of Prussia,Empire of Germany, have invented certain new and useful Improvements inPolypantographs,(which has been heretofore patented to me by theGovernment of Austria-Hungary by Letters Patent No. 5,949 and No.25,321, dated June 12, 1887,) of which the following is a specification.

This invention relates to certain new and useful improvements ininstruments used for reducing or enlargingdrawings or figures; and theobject of my invention is to provide an instrument of this kind by meansof which drawings can be enlarged or reduced, and at the same time anynumber of duplicates of the original or enlarged or reduced drawingproduced. I

The invention consists in the combination of pivoted bars, all as willbe fully described and set forth hereinafter, and finally pointed out inthe claims.

In the accompanying drawings, Figure 1 is a plan view of my improvedinstrument for enlarging or reducing drawings, the same being adjustedfor reducing drawings to one-half Fig. 2 is a plan view of theinstrument adjusted to reduce drawings to onefourth the original size.Fig. 3 is a cross-sectional view of the instrument shown in Fig. 1. Fig.4 is a diagrammatical top view of the wellknown pantograph, which isalso used for enlarging drawings. Fig. 5 is atop view of my improvedinstrument for reducing drawings, the same being adjusted for reducingdrawings to one-fourth of their original size; and Fig. 6 is adiagrammatical top view of the instrument, giving a graphicrepresentation of the different positions of the parts.

Similar letters of reference indicate corresponding parts. r

Fig. 4 shows the usual pantograph, in which dis the pivotal point, onwhich the instrument must be turned; f, the point at which the stylus isheld for following the lines of the drawing to be enlarged or reduced,and at z the pencil is held for drawing the enlarged or reduced drawing.In many cases it is necessary that the pencil should be outside of thepoint z, and this cannot be done with the ordinary pantograph. Theseobjections are over- The flat bars A B and B G are pivoted to each otherat B. The rods F D and D E are pivoted to each other at the point D, andare pivoted to the rods 0 B and AB at the points F and E, respectively.The points G, D,and A.

are in a straight line, and thepoint A is the pivotal point on which theentire instrument is turned, and if the instrument is turned on saidpoint the points 0 D will describe like lines-that is, lines eitherhaving the same curvature-or the same direction-for the reason that thetriangles Q B A and D E A have like angles. The-figures or linesdescribed by the points 0 D will be in the same proportion to each otheras the line C A is to the line D A.

A like system of rods, A B, B O, F D, D E, is arranged adjacent to therods A B, B O, F D, and D E. The points F F are connected by a bar, F F,and the points E E are connected by a bar, E E, as is shown in thediagram'matical view, Fig. 5, and in the plan view, Figs. 1 and 2. It isthus evidentthatparallel movements must always take place. It is alsoevident that if the instrument is shifted the points D D will have thelike movements or describe like lines. The points E E can be connectedby a rod, E E, and it is evident that this rod will describe the samepoint or movement as the points E E.

Instead of placing the pencil that is to draw the figures at D D, thepencils may be placed on the bar D D at any point between the points DD, or on an extension of the bar D D, and at all times the pencil willdescribe the same figures as the point D.

It is also evident that any suitable number of pencils can be fastenedon the bars, and they will describe the same figure as the points D D,and the figures described by the pencil or pencils on the bar D D willbe similar in shape to the lines or figures described by the points 0 C,but will be smaller. The points 0 C can also be connected by means of abar, 0C, and the stylus, which is drawn over the figure to be copied,can belocated at any part of the bar 0 O, or an extension thereof, andany number of pencils may also be fastened on the bar 0 0, so that atthe same time that the stylus is carried over the figure to be copied ordrawn a number of copies of the IOO same shape and configuration aremade by the series of pencils held on the bar 0 G-that is, a number ofcopies of the original are made.

By means of this instrument I am thus enabled to make a number of copiesof the original drawing at the same time, and at the same time I amenabled to make a number of copies of the same drawing on a reducedscale. Fig. 1 shows this apparatus for making drawings reduced one-half;but to permit of adjusting the apparatus for different sizes of drawingsthe different bars are provided with holes, through which the pivots H,Fig. 3, can be passed, which carry rollers N, running on the paper.

In the construction shown in Figs. 1 and 2 the points A A are on the barA A,which is fastened by suitable means on the drawingtable. The bar D Dis provided with an adjustable forked piece, 0, which can locked on saidbar D D, and carries a pencil on each end, thus permitting of drawingtwo reduced figures atthe same time. The stylus that is passed over thefigure to be copied is held on the end 0 of the bar 0 B; or, as shown indotted lines, it may be held on the bar 0 C, the same as in Fig. 5. Ifdesired, the sheet can be fastened on the part 0 and the pencil remainfixed. The sheet is thus shifted under the pencil by the carrier 0 andbar D D, and the drawing will also be copied.

It is evident that the fixed arms G G G2 of the rod D D describe thesame circles or lines as the bar D D.

The above-described implement can be used for the following purposes:First, for transmitting movements in the same direction with or withoutduplication and with any desired increase or decrease of said movements;and, second, this instrument can be used for making copies of anoriginal drawing in the same size, and making one or more copies in areduced or larger size.

If a series of the above-described instruments are connected to eachother in different planes, each can be used in making copies in adifferent plane.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In an instrument for making enlarged or reduceddrawings or duplicate copies of drawings in a reduced or enlarged scale,consisting of the bars A B, B O, D F, D E, pivoted at the points B, D,E, and F, respectively, the bars A B, B C, F D, and D E, pivoted to eachother at the points B D E F, and of the connecting-bars F F, E E,connecting the points E E and the points F F, substantially as shown anddescribed.

2. In an instrument for making enlarged or reduced drawings or duplicatecopies of drawings, consisting of the bars A B, B O, D F, and D E,pivoted at the points B D E F, respectivel y, the bars A B, B G, F D,and D E, pivoted to each other at the points B D E F, theconnecting-bars F F, E E connecting the points E and E and the points Fand F, and of the connecting-bar D D, for connecting the points D D,substantially as shown and described.

3. In an instrument for making enlarged or reduced drawings or duplicatecopies of drawings, consisting of the bars A B, B O, D F, and D E,pivoted at the points B D E F, respectively, with the bars A B, B O, DF, D E, pivoted to each other at the points B D E F, the connecting-barsF F, E E, connecting the points E and E and the points F and F, theconnecting-bar D D, for connecting the points D D, and the bar A A,connecting the points A A, substantially as shown and described.

4. In an instrument for making enlarged or reduced drawings or duplicatecopies of drawings in a reduced or enlarged scale, consisting of thebars A B, B G, D F, and D E, pivoted at the points B D E F,respectively, with the bars A B, B O, D F, D E, pivoted to each other atthe points B D E F, the connecting-bars F F, E E, connecting the pointsE E and F F, the connecting-bar D D, for connecting the points D D, thebar A A, connecting the points A A, and the bar GO, connecting thepoints 0 O, substantially as herein shown and described.

In testimony that I claim the foregoing as myinvention I have signed myname in presence of two subscribing witnesses.

EDUARD FRANKENBERG.

\Vitnesses:

B. ROI, ALEX SCHOLZE.

